chore: commit previously untracked runtime files (splits, auth, participants, shared)

src/app/api/me/route.ts

@@ -0,0 +1,8 @@
+import { NextRequest, NextResponse } from "next/server";
+import { getCurrentUser } from "@/lib/auth";
+
+export async function GET(req: NextRequest) {
+  const user = await getCurrentUser(req);
+  if (!user) return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+  return NextResponse.json(user);
+}